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Weight, Gravitational Force

  1. Dec 4, 2009 #1
    1. The problem statement, all variables and given/known data

    A mass weighs 20 N at the surface of a planet of 3000 km radius. What is the mass's weight when it is in orbit 3000 km above the surface of the planet?

    2. Relevant equations
    F = (Gm1m2)/r2 (well... not really)
    Ug = mgy


    3. The attempt at a solution
    I don't even know. I'm trying to find the g on this planet but I'm not sure where that would lead me... Help please >_<
     
  2. jcsd
  3. Dec 4, 2009 #2

    rock.freak667

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    Homework Helper

    what is the new 'r' you want to find? How does that relate to the original 'r'?

    r= r at surface then

    GMm/r2= ?
     
  4. Dec 4, 2009 #3
    yeah, i just needed to write the equations out instead of just thinking in my head

    thanks!
     
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